The luminderi (/luːmɪnˈderɪ/) is a glowing stranger with a surface as glassy and translucent as an incandescent lightbulb. The appearance of stripes and eye markings are created by different opacity levels in its surface, although no part of the luminderi is wholly transparent. Its head and torso radiate a heat of over 120°F, while its hands, feet, and tail are much cooler, allowing the luminderi to walk on grass and other flammable surfaces without setting them alight.
Although the luminderi moves as though fluid and flexible in its form, it is hard to the touch, and cannot be deformed by outside forces. Possessing a thin and delicate form, the luminderi can be smashed with even the slightest of impacts, its body breaking apart and shattering to pieces. Its glow can be attributed to a thick, luminous gas that fills its hollow body cavity. Much like the gas inside of neon signs, the luminderi's inner gas fails to persist once the vacuum of its hard surface is broken, all fluorescence immediately lost.
The luminderi's presence is accompanied by a quiet, humming buzz. Otherwise, it makes no sound and does not speak.
The luminderi appears in parks and gardens late at night, where it flickers into view as a bright flash of light, which dims after several seconds to reveal the luminderi's illuminated form. The luminderi is almost painfully bright immediately following its generation, but fades to its normal glow within ten to twenty minutes. It appears in quiet, tranquil settings, and prefers well-maintained flowerbeds, freshly mowed lawns and winding, woodchip-covered paths to the gnarled thickets of wooded lots and urban copses.
The luminderi's demeanor is calm and peaceful, and it ambles in slow but random paths within its environment. Its every movement is cautious and calculated so as to avoid shattering itself, as even one misplaced step upon a sharp-edged pebble is enough to break the luminderi's form. As such, it avoids hard surfaces, such as sidewalks or cobblestones.
The luminderi is drawn to flowers, and spends much of its time yanking them out in idle contentment. After breaking off the blossom, the luminderi places it back down upon the stem, sometimes picking it up and repositioning it until it is "just right." Plastic, cloth, or paper flowers, however, cause the luminderi to grow angry, and it squeezes these imitations in its palm with a tight and frustrated grip before it throws them away in rage.
Certain luminderi hold onto occasional flowers and pluck the petals one-by-one, as though caught up in some idle game of "he loves me, he loves me not." Individuals exhibiting this behaviour seem to appear more frequently in safer, less violence-prone cities.
Aside from this interest in flowers, the luminderi displays no particular regard for its environment, and while its glowing light often attracts small insects, the luminderi ignores these creatures altogether, even as they crawl upon its lightweight body.
When not moving, the luminderi lays down on the ground and dims itself, thus lowering its surface temperature so as not to set alight the grass around it. During the day, the nocturnal luminderi stands dormant as long as the sun eclipses its brightness, and only moves once the sun sets once more.
Although the luminderi does not, for the most part, display overt communication or gestures, it can be considered a social stranger, as it most frequently appears in groups, and does not leave the group in which it appears. In addition, luminderi in groups tend to glow brighter than lone individuals, and display slightly increased stability, thus making them less prone to burning out at random. Groups tend to work in quiet coordination to destroy all flowers within an area, and do not compete over flowers.
Despite the luminderi's social nature, however, groups tend to ignore other groups that they come across, and display slight wariness towards lone individuals that attempt to enter into the group. When approached by a lone luminderi, the most brightly glowing individual in the group approaches the loner and scratches a small, serial code-like marking on its surface. The individual that performs these actions does so carefully, and fatally pierces the loner's skin only four percent of the time. The marked individual displays no behavioural changes to this scarification, although a non-insignificant decrease in luminosity becomes apparent.
The luminderi's presence causes all non-broken lightbulbs to glow, and even unscrewed lightbulbs light up when held near the luminderi. The luminderi turns its head towards these objects with some curiosity, and etches a small mark onto the surface if given the chance.
In addition to its effect on lightbulbs, the luminderi's presence causes fireflies' bioluminescent cells to multiply at a rapid rate, compressing all other organs to a mortal degree. These insects fall from the ground, twitching with futile scratches, before they dim and go out, their death unnoticed by the luminderi itself.
The luminderi is initially shy around sensitives, and moves away from individuals who move suddenly or make loud sounds. Once it gets used to a sensitive's presence, however, it walks over with cautious, exceptionally slow steps, and, when able, places a flower on the sensitive's foot. Statues of human beings elicit this same wary response.
The luminderi also takes particular interest in lying-down sensitives, corpses, and other prone, human-shaped figures. When it encounters one, it covers their body with flowers, stopping only once there are no more blossoms to harvest within an area.
When touched by a sensitive, the luminderi glows slightly dimmer, and although the luminderi's hot surface temperature can make prolonged touch painful, physical contact with one causes no ill effects, otherwise.
The luminderi is rather short-lived, and burns out without warning at the end of its life. Other luminderi place flowers around the hollow, unlit corpses of their companions, which remain in place until shattered. Shattered corpses crumble into thousands of tiny shards, which glimmer as they dissipate, like fragments of ice.